Dobby for looms



Jan. l5, 1926.

E. c. AMSDEN DOBBY FOR LO OMS Filed April 5. 1922 Patented Jan. 5, 1926.

N *UN1TEDsTArEs To all whom t may concern.: Be it known that I, EUGENE ,-GAMSDEN, a citizen of the UnitedStates, residingy at Allston,` Boston, in the county of Suffolk, 5 State offMassachjusetts, have invented a cer-v tain new anduseful Improvement in fDobf" bies for Looms, of which the followingis a.r specification, referencebeing had `therein to the accompanying drawings. i

The invention hasrelation to loom shedding mechanisms of the type known asdobbies, and more particularly to the hooks andk jaclolevers. or baclelevers which are combined with thefharness-levers pertaining to such mechanisms. Y p

K bjects of the invention are to reduce the cost of the hooks andlevers aforesaid,- secure greater uniformity and accuracy of shape, and produce hooks and levers havingv a 'better finish and yappearance than inthe case ofvthose heretofore in use.`

.Dobby hooks and jack-levers `or back'- levers` heretofore in actual use, so far as knownto me,\have been composedof malleable iron, produced by a procedure involving irst casting and subsequently annealing the parts. This entails considerable cost and renders the necessary selling price comparatively high. As produced, the parts :io vary moreorless `from the required shape.

and theyE lackuniformity of shape, necessitating more `or less manipulation and re shaping in fitting and assembling them for use.' Moreover, they are rough and present more or less unfinished appearance. e,

y AThe invention consists in the hook produced as hereinafter explainedas a stamping of cold rolled steel, with a, hole through its butt, rand having a pivot-pin fitting said 40 hole with` a' tight driving fit andl thereby securely aflixed to the hook. 'Also, in a jacklever or back-.lever composed of two inembers of stamped or punchedsheet met-al, preferably cold rolled steel, securedtogether i5 Aface to face by Welding, and having rthe special features to which reference'is lllade hereinafter. .Such hooks and levers `are much lessexpensivm can be produced much i more expeditiously, can be made moreun- 5 form` in shape, require less work yin, fitting `them foruse, and have a smooth nished a pearance when they come y'from the dies,

PATENT OFFICE.g

`EUGENE c. AMSDEN, OFALLSTON, Bosron, MASSACHUSETTS, ASSIGNOB. To THE `STAF-` FORD COMPANY, OE LBOSTOMMASSACHUSETTS, A CORPORATION or MASSAOHUL DOBBY FOR LOOMs.

Application, filed April' 5, 1922. Serial No. 549,785.

and require less attention than -casthooks and levers. e

In the drawings,-

therewith.

Fig. 2 is an edge View thereof looking -and 2.

Figs. 5` and are views in section inthe planes. indicated by dotted lines 5-5 and G-A-G .in Figs. l and 2..v V

Having reference to the drawinga? .G

Fig. l shows in side elevation ajaok-lever4 or bach-lever made rnaccordance with the` invention, with a pa1r-of hooks connected- The jack-lever `or back-lever land hooks `2, 2, correspond in form andinmodeof'use with the like parts of dobbies in -us'efat the present time.` f 1 The lever l is, in conformity 'with vtheiinvention, of the composite 'or I oult-upr-` Struct ture indicated in Figs. 2,3, yand'tynalnely composed .of two pieces-of sheet metal comfpr-ising the members `1l 'and 12 :indicatedin Fig. 2; and shown separately in F igs. gand 4l., lIn the process of making the'fleverthese twol members are separately stamped `from sheet metal, preferably cold rolled' steel; and are then permanently united,- by welding. In the present instance they are vassumed to be, unitedfby spot welding at'thepoints w, rv, Fig. l, as indicated bythe shaded spots. The hooks 2, 2, may bemade by casting in some instances, but preferablyyas; oneV feature/of the invention, they are stamped from lsheet metal, each with a hole-or eye atlthe portions of the two members 11 and 12 are i spaced apart at each end4 of the lever by meansiof an offset 121 made in oneofv the members by bending lthe end-portionaway from the plane Of the adjacent member into a planeparallel with that of thesaid adjaf tern chain of the dobby, as usual in certain classes of dobbies.

At each end of the lever, alongside the offset portion 121 of one member, a lateral flange or lip 111 is formed on the other member. this flange or lip being produced by bending a projecting marginal portion of the end-portion of the latter member around toward the offset so that the edge of the lip and the inner surface of the said offset portion come together.

The flange or lip 111 serves as a spacer by means of which the proximate end-portions of the two members are held at a proper distance apart to accommodate the butt of a hook, and avoid binding on the said butt so as to interfere with free swinging movement of the hook.

One extremity of the lip 111 constitutes a stop for the hook` by means of which the hook is prevented from becoming thrown back too far from its working;r position.

Preferably, in forming the respective members of the lever, the offset portion of each member is formed with a slight inclination toward the planeof the body-portion of the member, to insure that when the two members are brought together the slightly inclined off-set portion of one member shall converge toward the other member and bear against the edge of the lipl of the other member, instead of opening away from the other member. Y i

In bending the lip 111 around, the corner at 112is rounded in cross section, as shown 1n Fig. 6, so that thereby the tendency of the end-portion of the next adjoining lever 1n the dobby to catch against such portion of the lever, which catching might interfere w1th the proper working of the parts. is avoided. l

In the operations of making the respective members 11 and 12 of a lever, holes are punched in the ends of such members at 113, 113, f or the reception of the end-portions of the plvot-pins 3, 3, of the hooks. Holes t are punched at the middle of the respective members 11 and 12 to receive the pivotal projection from a harness-lever by means of which the lever 1 is mounted upon such harness-lever. In order to provide the lever 1 with a longer bearing upon the said pivotal projection I preferably offset as at 111. Figs.

1, 2 and 5, the metal of one of the members,

as the member 1l, around the hole 4. Preferably, also, in order to retard enlargement of the holes 4 of the two members, as a result of wear due to use, I place a washershaped ring 5, shown in Fig. 5, between the two members 11 and 12 in the recess produced by the offsetting of one of the said members.

In the process of manufacture., the washer 5 is seated in the recess in member 11; the hooks 2, 2, with pins 3, 3, applied to their butt-ends and projecting at opposite sides of the hooks, as indicated above, are placed between the end-portions of the two members 1l and 12; and the parts are brought close together, with the end-portions of the pivotpins 3, 3, seated in the bearing-holes 113, 113, of the two members, and with the two members in contact with each other throughout their length. The parts having been thus assembled, the members 11 and 12 are fastened together, by welding, as for instance by spot welding as already described. The holes at 4 in the two members and in the washer are then reamed out.

Should it be desired to relnove a hook for any purpose, as for the purpose of replacing a worn hook by another, this may be eHected by driving out the pivot-pin 3, and replacementmay be effected by inserting the hook into the empty space between the corresponding end-portions of' members 11 and 12 and driving a pivot-pin into place. The driving t of such pin within the eye in the butt of the hook will hold the pin in place, while the looser fit of the pivotal portions of the pin in the bearing holes made in the said endiportions of the two members 1l and 12 will enable Such pivotal portions to turn in the said bearings. Or, the two endportions of the members 11 and 12 may be sprung apart temporarily to permit disengagement of the pivot-pin from the bearings in such end-portions, and the removal of the old hook, followed by the insertion of a hook into place and engagement of the ends of its pivot-pin in the said bearings, after which the two end-portions of the members 11 and 12 may be permitted or caused to close together upon the inserted hook. To prevent the metal of the offset portion 121 of a lever-member from giving wayA in these operations and becoming set at the shoulder where such offset portion extends away from the plane of the body of such member, I form the said shoulder at an incline relative to the length of said member, as shown best in Fig. 1.

What is claimed as the invention isz- 1. The combination with a dobby jacklever having a pair of bearings spaced apart to receive the butt of a hook between them. of a hook constituted by a .stamping of sheet-metal formed with a hole through its butt, and a pivot pin fitting said hole with a tight drivlng flt, and thereby securely effXed to the hook, and with its ends projecting at opposite sides of thehook and working in said bearings.

2. A dobby-lever composed of companion members constituted by stampngs of sheet- Vro metal welded together face to face, each member having one end-portion thereof offset to accommodate a hook between it and the adjoining end-porton of the other mem# ber, and each member vhaving the said ed:V

'oining end-portion thereof provided with a o set portion of the other member, with the external corner along the said lip or ange l5 rounded in cross-Section, and having combined therewith hooks pivoted between the spaced-apart end-portions at the opposite ends of the lever.

In testimony whereof I ax my signature.

EUGENE o. AMsDEN. 

